<!DOCTYPE html>
<html>
	<head>
		<title>Test</title>
		<!-- <link rel="stylesheet" type="text/css" href="main.css"> -->
		<link rel="stylesheet" type="text/css" media="all and (min-width:640px)" href="full.css">
		<link rel="stylesheet" type="text/css" media="all and (max-width:640px)" href="mobile.css">
	</head>
	<body>
		<h2 class="hello">Hello</h2>
		<h2 class="world">World</h2>
	</body>
</html>